HttpClient4基础1--通过匿名代理访问网页

http://llying.iteye.com/blog/456455

HttpClient发布4.0了 而且底层完全重写了，据说无论是效率还是结构都有质的飞跃。 
现在也要与时具进，研究研究。 

Java代码  

1. package test.httpclient4.proxy;  
2.   
3. import java.io.BufferedReader;  
4. import java.io.IOException;  
5. import java.io.InputStreamReader;  
6.   
7. import org.apache.http.HttpEntity;  
8. import org.apache.http.HttpHost;  
9. import org.apache.http.HttpResponse;  
10. import org.apache.http.HttpStatus;  
11. import org.apache.http.StatusLine;  
12. import org.apache.http.client.ClientProtocolException;  
13. import org.apache.http.client.HttpClient;  
14. import org.apache.http.client.methods.HttpGet;  
15. import org.apache.http.conn.params.ConnRoutePNames;  
16. import org.apache.http.impl.client.DefaultHttpClient;  
17. import org.apache.http.message.BasicStatusLine;  
18. import org.apache.http.util.EntityUtils;  
19.   
20.   
21. public class GetHttpByProxy {  
22.   
23.     public static void main(String[] args) throws ClientProtocolException,  
24.             IOException {  
25.         //实例化一个HttpClient  
26.         HttpClient httpClient = new DefaultHttpClient();  
27.         //设定目标站点  
28.         HttpHost httpHost = new HttpHost("www.shanhe114.com");  
29.         //设置代理对象 ip/代理名称,端口  
30.         HttpHost proxy = new HttpHost("192.168.1.28", 5608);  
31.         //对HttpClient对象设置代理  
32.         httpClient.getParams().setParameter(ConnRoutePNames.DEFAULT_PROXY,  
33.                 proxy);  
34.         HttpGet httpGet = new HttpGet("/");  
35.         //这里也可以直接使用httpGet的绝对地址，当然如果不是具体地址不要忘记/结尾  
36.         //HttpGet httpGet = new HttpGet("http://www.shanhe114.com/");  
37.         //HttpResponse response = httpClient.execute(httpGet);  
38.           
39.         HttpResponse response = httpClient.execute(httpHost, httpGet);  
40.         if(HttpStatus.SC_OK==response.getStatusLine().getStatusCode()){  
41.             //请求成功  
42.             //取得请求内容  
43.             HttpEntity entity = response.getEntity();  
44.             //显示内容  
45.             if (entity != null) {  
46.                 // 显示结果  
47.                 BufferedReader reader = new BufferedReader(new InputStreamReader(entity  
48.                         .getContent(), "UTF-8"));  
49.                 String line = null;  
50.                 StringBuffer strBuf = new StringBuffer((int) entity.getContentLength());  
51.                 while ((line = reader.readLine()) != null) {  
52.                     strBuf.append(line);  
53.                 }  
54.                 strBuf.trimToSize();  
55.                 System.out.println(strBuf.toString());  
56.             }  
57.             if (entity != null) {  
58.                 entity.consumeContent();  
59.             }  
60.         }  
61.     }  
62. }  

对于显示将结果转换成String以备后续使用，HttpClient已经为我们提供了一个简便方法 
如下 

Java代码  

1. System.out.println(EntityUtils.toString(entity,"utf-8"));